I didn't know that, but saw it last night on /r/pittsburgh... I would go see The Road and eat $.20 wings tomorrow night but apparently they aren't showing it at the South Side theater.
See the comments here for more $5 locations - http://iheartpgh.com/2009/11/29/5-movies-and-more/
There is also a dollar theater just outside of Pittsburgh. The movies aren't brand new but it is a good deal if you are up for a little drive.